I have seen some slides of a presentation for the next expansion while working.
Firstly the expansion is called “The Dreaming”.
Azeroth has been injured further in the fight against the jailer so the heroes must travel to the emerald dream in an attempt to restore Azeroth.
There is a faction merge
The level cap remains at 60. There is some new “paragon” leveling system. I don’t know too much about how this will work
There is player housing in a select few zones.
No new class
There are allied races from the shadowlands.
There is some sort of corruption spreading in the dream that we must stop. One of the zones is a dead forest that is overrun by corruption. Another is where the well of eternity would be, an old god is attempting to manifest here.
Ysera helps us travel there.
A faction called the wild druids these give new druid forms as a reward.
A Legendary trinket from the main quest line.
Cities will build and evolve in the dream caused by player actions this can open new opportunities and close others. Defend these from invaders that despise your presence and gather resources to help the settlement expand.